SKU: 9109321220

ARCO Marine Zeus 24V 4kW Low Turn On (LTO) 3.15 Alternator w/Isolated Ground [4401]

Sale price$642.51 Regular price$713.90
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Ships within 48 hours · Estimated delivery Aug 22 - Aug 27

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Description

ARCO Marine Zeus 24V 4kW Low Turn On (LTO) 3.15 Alternator w/Isolated Ground [4401]Zeus 24V 4kW Low Turn On (LTO) 3. 15 Alternator with Isolated Ground The ARCO Zeus 24v 4kW LTO alternator turns on at lower RPMs, runs cooler, and provides more power than older designs that are larger and heavier. This alternator continuously generates over 1. 4kW (51 Amps) at just under 1,500 RPM and almost 2. 4kW (87 Amps) at 2,000 Alternator RPM. Put in real world terms, a marine diesel engine idling at 750 RPM with a 2: 1 pulley ratio is

Zeus 24V 4kW Low Turn On (LTO) 3.15 Alternator with Isolated Ground

The ARCO Zeus 24v 4kW LTO alternator turns on at lower RPMs, runs cooler, and provides more power than older designs that are larger and heavier. This alternator continuously generates over 1.4kW (51 Amps) at just under 1,500 RPM and almost 2.4kW (87 Amps) at 2,000 Alternator RPM. Put in real-world terms, a marine diesel engine idling at 750 RPM with a 2:1 pulley ratio is generating over 1.5kW (55 Amps), and a Mercedes Sprinter at 750 RPM with a 3.21:1 ratio is generating over 2.5kW (91 Amps)!

The ARCO Zeus 24v 4kW alternator turns on at lower RPMs, runs cooler, and provides more power than older designs that are larger and heavier. The newest generation of 24V performance has arrived.

Competitor’s 24V alternators utilize a 12V rotor and field current which is less efficient and limits output at all RPMs. ARCO utilizes a native 24V rotor and field current. This results in our 24V alternator running cooler than competitor’s 24V alternators, having a direct impact on the alternator lifespan.

Features:

  • Engineered for high energy production.
  • Suitable for marine, RV, military, and commercial applications.
  • Rapidly charges large battery banks.
  • Coolest operating temperatures for increased performance:
  • Heat shedding coatings
  • Rectifier located on housing exterior
  • Dual cooling fans
  • OEM components
  • Optimized for performance at cruising speeds.
  • Reduces the need for a generator by creating additional power with your engine.
  • Unleash peak performance with E-Coat/Cerakote, keeping the high amp alternator cooler for sustained amperage output.
  • Use the ARCO Zeus Bluetooth Alternator Regulator for maximum performance or lithium battery charging.
  • SAE J1171 Certified.
  • Proudly made in the U.S.A.

Technical Specifications:

  • Voltage - 24v
  • Field Type - P
  • Rotor Poles - 16
  • Stator Size - 138mm
  • Frame Size - Large
  • Weight - 15.89lbs/7.2kg
  • Regulation - External Only
  • Finish - (Black) E-coating
  • Cut-In RPM - 1,072 Alternator RPM
  • Maximum Alt RPM - 19,000
  • Battery Post - M8 Thread Post, Side Mount
  • Standard Pulley - 49K6 (6-groove, 49mm)
  • Pulley Mount - 17mm diameter shaft, 25mm long, threaded M17 x 1.5
  • Pulley Hardware - M17 x 1.5 x 24mm nut, w/ 18mm ID x 29mm OD washer (Included)
  • Diodes - 6 positive, 6 negative, 50A Rated, Avalanche
  • Max Output (Cold, 9,000 RPM) at 27.5v - 144 Amps - 3,960 Watts – 5.7Kw PTO
  • Sustained Cruising Output (Hot, 6,000 RPM) at 27.5v - 130 Amps - 3,575 Watts – 5.1Kw PTO
  • Sustained Idle Output (Hot, 3,000 RPM) at 27.5v - 108 Amps - 2,970 Watts – 4.2kW PTO
  • Max Continuous Operating Temperature - 100°C / 212°F

Mounting Application:

  • Replaces most small case styles using a 3.15" J180 saddle style mount (e.g., Hitachi, Lucas, Mitsubishi) Most Yanmars.

Quick Guide (pdf)
Brochure (pdf)
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 9109321220

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4.6 ★★★★★
Based on 8 reviews
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O
Verified Purchase
oldguy
Omaha, US
★★★★★ 5
Inexpensive, not cheap, with useful added features
Color: A4 - Blue / Black
First impressions: 1. The watch has features unexpected at this price point: a. Stainless case (claimed) and back b. Glass, not plastic, crystal c. Functioning luminosity (duration to be tested) of hands (not seconds) and 5-minute tics d. Day/date display e. Clear setting instructions in english f. Sweep second hand 2. Packaging was not fancy, but effective; watch arrived in perfect shape with no visible defects: Flat cardboard box in cardboard sleeve with embossed logo, fitted foam box liner, plactic film around watch, protective plactic discs on crystal and stainless back. 3. Overnight delivery via Amazon to my front door (much better than USPS) 4. Faux-croc band looks and feels fine for now 5. Setting mechanisms all worked smoothly 6. The black watch is quite handsome, if not elegant, with a simple, understated blue dial and gold markers; the photos in the listing were a faithful representation 7. I measured the case at a fraction of a mm over 39, the max for my small wrists 8. I observed some nits that are to be expected at this price point: a. Second hand alignment is off by a quarter oFirst impressions: 1. The watch has features unexpected at this price point: a. Stainless case and back b. Glass, not plastic, crystal c. Functioning luminosity (duration to be tested) of hands (not seconds) and 5-minute tics d. Day/date display e. Clear setting instructions in english f. Sweep second hand 2. Packaging was not fancy, but effective; watch arrived in perfect shape with no visible defects: Flat cardboard box with embossed logo, fitted foam liner, plactic film around watch, protective plactic discs on crystal and stainless back. 3. Overnight delivery via Amazon to my front door (much better than USPS) 4. Faux-croc band looks fine 5. Setting mechanisms worked smoothly 6. The black watch is quite handsome, if not elegant, with a simple, understated blue dial and gold markers; the photos in the listing were a faithful representation 7. I measured the case at a fraction of a mm over 39, the max for my small wrists 8. I observed some nits to be expected at this price point: a. Second hand alignment is off by a quarter of a second from second marks b. Black case is excessively shiny; probably is not ion-coated and finish may not be very durable, but was preferable to me over the gold, which I am sure will mar easily c. Watch has a snap-on (not screw-on) back and minimal water resistance Bottom line, I seem to have received exactly what was offered, which is a lot for around $30
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 16, 2023
J
Verified Purchase
Jimbo
Charlottesville, US
★★★★★ 5
The watch Is beautiful, keeps time & date well and seems to be made of quality materials
Color: A1 - Blue / Brown
First off I have not had a watch in 20 years since I use my phone for the date and time. I decided to try using one again and love not having to retrieve my phone to check the time. The watch is beautiful and I love the look of the gold with the blue face and brown band. It works great and appears to be of the same quality as the Seiko watches that I use to own. I tested the face and tried to scratch a small area with a sharp object. I would not scratch so it is either glass or a crystal. the metal seems to be of good quality and the band is comfortable and feels like leather. Overall I am happy with it and will update this review if the situation changes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 12, 2024
D
Verified Purchase
Dennis Stalzer
Draper, US
★★★★★ 4
Nice looking watch with day and date
Color: A5 - Black
This watch has a nice black face and looks like it is high quality considering the price. I guess time will tell how durable it is. The only thing I am not as pleased about is the band which is stiff and is not as comfortable as another watch that has a leather band.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 18, 2026
S
Verified Purchase
Sunflower
Phoenix, US
★★★★★ 5
A stylish watch at a moderate price
Color: B1 - Gold / Brown
This wrist watch is stylish and at a modest price. The watch was given as a gift 🎁
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 4, 2025
L
Verified Purchase
Lisa Ahrensbach
Whiting, US
★★★★★ 5
Durable. And no batteries required.
Color: A2 - Black / Brown
Best watch I've ever used. No batteries needed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 19, 2026

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